故障后转子侧变流器不间断控制下的双馈风机序网等值电路

发布时间：2018-05-25 03:44

本文选题：双馈风电机组 + 变流器控制　；参考：《电网技术》2017年02期

【摘要】：为应用方便直观的电路方法进行双馈风电并网系统故障分析和短路计算,针对电网故障后转子侧变流器(rotor side converter,RSC)控制方式提出一种双馈风机(doubly-fed induction generator,DFIG)序网等值电路。故障后RSC不间断控制的运行方式下,DFIG定子短路电流中含有幅值稳定的工频正负序分量、2个衰减速度不同且频率接近工频的正序分量以及衰减直流分量。分别推导了各交流成分对应的序网等值电路,其中,稳定工频正序分量对应的等值电路可用等值电势及正序阻抗来表示;稳定工频负序分量对应的等值电路用无源的负序阻抗来表示;而衰减交流分量可用受控电流源来描述。利用所提DFIG等值电路,应用传统序网分析方法即可方便进行短路计算,不需仿真就能获得双馈风机并网系统中各处的短路电流。通过PSCAD仿真验证了所提等值电路和解析算法的有效性。
[Abstract]:In order to carry out fault analysis and short circuit calculation of doubly-fed wind power grid-connected system with convenient and intuitive circuit method, an equivalent circuit of doubly-fed fan's doubly-fed induction generator (DFIGG) sequence network is proposed for rotor side converter (side) control mode after power grid failure. Under the operation mode of uninterrupted control after failure, the short-circuit current of RSC stator contains positive and negative sequence components with stable amplitude, two positive sequence components with different attenuation velocities and frequencies close to power frequency, as well as attenuated DC components. The sequence network equivalent circuits corresponding to each AC component are derived respectively, in which the equivalent circuit corresponding to the stable power frequency positive sequence component can be expressed by equivalent potential and positive sequence impedance. The equivalent circuit corresponding to the steady power frequency negative sequence component is represented by the passive negative sequence impedance, while the attenuated AC component can be described by the controlled current source. Using the proposed DFIG equivalent circuit and using the traditional sequence net analysis method, the short-circuit calculation can be carried out conveniently, and the short-circuit current in the grid-connected system of the doubly-fed fan can be obtained without the need of simulation. The effectiveness of the proposed equivalent circuit and analytical algorithm is verified by PSCAD simulation.
【作者单位】：西安交通大学电气工程学院;西安热工研究院有限公司;
【基金】：国家自然科学基金资助项目(51277143)~~
【分类号】：TM614

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